When I was a sophomore in college, I lived in a dormitory suite with nine other guys: six bedrooms, two sitting rooms, and a large locker-room style bathroom. About mid-way through the first semester, one of our number, a 3rd-year biochemistry major, suggested that set up a small brewery in one of the sitting rooms. We all read up on how to make beer and thought it was a great idea; so we helped him do it. It takes three to four weeks to make a batch of beer, so over the next few months we made quite a bit of beer.
Then, late in the spring semester, one of our roommates had a chance to get some yeast from a famous California champagne producer, so we thought we’d use it in our beer. We thought we’d be super-cool making beer with champagne yeast and our beer would be magnificent; we weren’t and it wasn’t. In fact, it was downright awful.
It turns out that not all yeasts are the same!